#include <STC15F2K60S2.H>
#include <INTRINS.H>

sbit TX = P1^0;
sbit RX = P1^1;
void Delay13us()		//@12.000MHz
{
	unsigned char i;

	_nop_();
	_nop_();
	i = 36;
	while (--i);
}



void ulrte_int()
{
	uchar i;
	for(i=0;i<8;i++)
	{
		TX = 1;
		Delay13us();
		TX = 0;
		Delay13us();
	}
}


uchar csb_read()
{
	uint temp;
	CMOD = 0X00;
	CH = CL = 0;
	
	EA = 0;
	ulrte_int();
	EA = 1;
	CR = 1;
	
	while(RX ==1 && CF == 0);
	
	CR = 0;
	if(CF == 0)
	{
		temp = (CH<<8) | CL ;
		return temp *0.017;
	}else{
			CF = 0;
		return 0;
		
	
		 }



}